Failure analysis of flange used for urea hydrolysis equipment

HUANG Jinyang; YANG Zheng; LU Jintao; ZHANG Bo; YANG Zhen; XU Hongjie

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Failure analysis of flange used for urea hydrolysis equipment

Thermal Power Generation Issue 5, (2016)

更新时间：2025-09-28

- Failure analysis of flange used for urea hydrolysis equipment
- 作者机构：
  
  西安热工研究院有限公司,陕西,西安,710032
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG172.82
- Published Online：15 June 2016，
  
  Published：2016
- 稿件说明：
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HUANG Jinyang, YANG Zheng, LU Jintao, et al. Failure analysis of flange used for urea hydrolysis equipment[J]. Thermal Power Generation, 2016, (5).
DOI：

HUANG Jinyang, YANG Zheng, LU Jintao, et al. Failure analysis of flange used for urea hydrolysis equipment[J]. Thermal Power Generation, 2016, (5). DOI：

摘要

针对现役烟气脱硝用尿素水解装置中氨气出口密封法兰失效问题，采用宏观检验、金相分析、扫描电镜和X-射线衍射等方法

对TP304不锈钢材料密封法兰失效原因进行了分析。结果表明：法兰腐蚀失效主要是由尿素水解后高温高压中间产物引起的持续性点蚀和溶解腐蚀导致；腐蚀产物以Fe和Cr的氧化物为主，其结构疏松

存在大量孔洞和裂纹；TP304不锈钢不适宜用作烟气脱硝用尿素水解装置氨气出口密封法兰材料。

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